Molecular and Cellular Biochemistry

, Volume 305, Issue 1–2, pp 63–69 | Cite as

The role of gender differences in beta-adrenergic receptor responsiveness of diabetic rat heart

  • Ayca Bilginoglu
  • Figen Amber Cicek
  • Mehmet Ugur
  • Hakan Gurdal
  • Belma Turan


Since the mechanisms responsible for gender differences in cardiac contractile function have not been fully elucidated, we focused to determine the effect of gender difference on β-adrenergic receptors (β-ARs) signal transduction in ventricular cardiomyocytes from insulin-dependent diabetic (streptozotocin-induced) rats. Dose-response curves of left ventricular developed pressure (LVDP) to isoproterenol (ISO) in females showed that there was only a ∼30% decrease in the maximum response without a significant shift in EC50 in diabetic females. On the other hand, diabetes induced a clear rightward shift in the potency (5–10 folds) without a significant change in the maximum response in the males. In order to further determine of the underlying mechanism for this difference, we measured cAMP production and obtained dose-response curves with ISO stimulation in isolated cardiomyocytes. In diabetic females, there was no obvious change in the cAMP dose-response curve. On the other hand, there was a significant decrease in the maximum response without any apparent change in the potency of diabetic males. Our findings indicate that male and female rats are affected differently by diabetes in terms of LVDP responses to β-ARs stimulation. Also, the difference between their β-ARs induced cAMP responses may underlie this disparity.


Diabetes Gender differences Beta-adrenergic signal transduction cAMP G-proteins Cardiomyopathy 



This work has been supported by grants of Ankara University project 2006-080-9233 and projects of TUBITAK-SBAG-PIA-10 (105S149) and TUBITAK-SBAG-3056 (104S591).


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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Ayca Bilginoglu
    • 1
  • Figen Amber Cicek
    • 1
  • Mehmet Ugur
    • 1
  • Hakan Gurdal
    • 2
  • Belma Turan
    • 1
  1. 1.Department of Biophysics, School of MedicineAnkara UniversityAnkaraTurkey
  2. 2.Department of Pharmacology, School of MedicineAnkara UniversityAnkaraTurkey

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